The mold created in this project can be used for much more than just ice cubes- try making Jello tetris pieces, or tetris soap, tetris Popsicles, or even tetris ground beef squares!
Mmmmm ... ground beef squares
Step 1: Materials
1. 1" thick wood (or any other solid material you have the ability to make the cubes out of; ie acrylic or metal can also be used)
5. Wood glue
6. Molding Silicone
7. Hot glue gun
8. Exacto knife
Step 2: Making the blocks
Making the cubes:
1. Cut the 1" thick board into 1" wide strips. Further cut these strips into the 1" cubes necessary. A table saw and chop saw make creating the cubes much easier. I recommend making a few more cubes than necessary to have extra (just in case).
2. To form the "classic" tetris block shape we will sand off the corners of each of the cubes 1/8".
Step 3: Making the tetris pieces
1. Layout and glue the pieces together using wood glue.
Step 4: Making the positive
Once the positive housing is made, glue the tetris blocks to the bottom using a hot glue gun.
To prevent the silicone from sticking to the wooden blocks coat each of them in olive oil, or a non-sticking substance specifically designed for your exact type of silicone.
Step 5: Pouring the silicone
Pour the silicone mix over the wooden blocks, filling the housing to the rim.
Let set according to the directions provided (usually it will be at least 10 hours).
Step 6: Removing the negative
Using a sharp knife, cut around the sides between the housing and the silicone.
If possible break away the sides of the housing (it will make removing the bottom much easier).
Pry the bottom of the housing off of the silicone. Because of the undercuts on the blocks, the tetris pieces will probably remain trapped in the silicone.
To remove the blocks from the silicone:
Using an exacto knife cut away the silicone trapping the blocks in the negative. Once enough silicone is removed flex the mold a bit, and you should be able to peel out the wooden tetris pieces.
Step 7: Making the ice cubes
To make colored tetris cubes, first look up which game color scheme you would like to use from
Next mix food coloring and water to best try and match those colors.
Pour the colored water into the mold and let sit until frozen (5-6 hours).